FeCl_2 による炭素飽和溶鉄の脱珪

概要

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If reaction products of steelmaking reaction are gaseous, some problems on produced slags are reduced. Present work examined fundamentally, if desiliconization by vaporization method was possible or not. About 30g of molten iron saturated by carbon and containing various amounts of silicon was melted in a graphite crucible. When Cl_2 is blown into the molten iron, chlorination of silicon and ferrous metal occurred simultaneously. Since chlorination rate of ferrous metal is faster than that of silicon, silicon is enriched in the molten iron apparently. When FeCl_2 powder filled in a pocket of plunger made of graphite is dipped into the molten iron, only silicon is chlorized. The chlorination rate of silicon by FeCl_2 can be expressed as a first order reaction equation with respect to silicon content in iron. The apparent rate constants of the reaction are affected by the plunger pocket size and mass of molten iron. However, the rate constants are not affected by temperature. The relationship among initial silicon content of the molten iron, [%Si]_O, that at time t, [%Si]_t, mass of FeCl_2 in the plunger pocket, W_p, sum of mass of FeCl_2 supplied to the molten iron, W_f, and mass of the molten iron, W_s, can be expressed as follows : -ln [%Si]_t/[%Si]_O=exp(-W_p-1.05)/W^<0.81>_s W_f The major reaction product was observed as SiCl_4.
社団法人日本鉄鋼協会の論文
1989-05-01